Study On Controlled Synthesis And Photocatalytic Properties Of BiVO₄Nano Materials

With the population expansion and high-speed of the industrialization process in nowadays society，the environmental problems have seriously threaten the human survival environment and health. In theseyears,although some methods used to handle chemical pollution that have played certain roles in protectingand governing the environment, there are also some problems, such as: low efficiency,may cause secondarypollution and high energy consumption.The drawbacks have hindered the large-scale popularization andapplication of these technology. As an emerging technology,photocatalysis has attracted extensiveattention.However, the commen photocatalyst TiO₂,beause its wide band gap and high recombination rate,can only be activated by UV-light （the utilization rate is only3-4%of the incoming solar energy）.Therefore, many efforts have been carried out to develop novel photocatalysts with highefficiency,visible-light-response and stability of the photogenerated electron-hole pairs. Recently, manyresearchers focus their efforts on BiVO₄due to its narrow band gap and good catalytic activity.Base on the above analysis,in this paper we studied the preparation and photocatalytic property ofBiVO₄,The main content was listed as follows:1. Olive-shaped monoclinic BiVO₄were synthesized with a colloidal carbon spheres （CCSs） as hardtemplate by a mild hydrothermal treatment process.The morphologies,crystals, structures and composing ofthe products were well-characterized by SEM and XRD. The absorption range of the sample was measuredby UV–vis absorption spectroscopy.Subsequently,their visible-light photocatalytic performance was evaluated via dyes rhodamine B （RhB）degradation. Special attention was paid to evaluate the correlation of the reactivity with crystal structure,morphology of as-prepared BiVO₄samples.2. Monoclinic BiVO₄with peanut-shaped were synthesized by a mild hydrothermal treatment processwith Sodium Citrate-assisted.The morphologies, crystals, structures and composing of the products werewell-characterized by SEM,XRD and. N2adsorption–desorption technique was used to research thespecific surface area and pore structure of the products.The absorption range of the sample was measuredby UV–vis absorption spectroscopy.Subsequently, their visible-light photocatalytic performance wasevaluated via dyes rhodamine B （RhB） degradation. 3. Bi₂O₃/BiVO₄@C were synthesized by a mild hydrothermal treatment process.The morphologies,crystals, structures and composing of the products were well-characterized by SEM and XRD. Theabsorption range of the sample was measured by UV–vis absorption spectroscopy. Their visible-lightphotocatalytic performance was evaluated via dyes rhodamine B （RhB） degradation. Special attention waspaid to evaluate the correlation of the reactivity with the content of Bi₂O₃in the products.